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Alldays & Onions alloys aluminium approx belt bending bevel gears blades blank bolts British Standard bronze Brooke Tool Manufacturing capacity carbon cast cast-iron centre coal combustion compression compressor conveyor corrosion cutter cycle cylinder diamond tools draught drill drive economiser efficiency electrical Engineering enthalpy evaporation expansion face-width factor feed flanges flue formula Fraser friction fuel oil furnace gases gauge given heating surface helical gears iron lathe lathe tools load lubricating oils Machine Tool Maquinas material maximum mechanical metal mild steel moulding number of teeth obtained Oldbury operation pipes Pitch diameter plant production pulley PUMPS ratio reduced screw threads screwed shaft specific gravity specific heat spur STEAM PRESSURES stress superheat surface finish Table temperature tensile strength thickness threads tooth total head tubes turbine usually valve velocity viscosity water-tube boilers weight welded wheel worm gears